package com.atguigu.yygh.common.helper;

import io.jsonwebtoken.*;
import org.springframework.util.StringUtils;

import java.util.Date;

public class JwtHelper {
	private static long tokenExpiration = 24*60*60*1000;
	private static String tokenSignKey = "123456";

	public static String createToken(Long userId, String userName) {
		String token = Jwts.builder()
				.setSubject("YYGH-USER")
				.setExpiration(new Date(System.currentTimeMillis() + tokenExpiration))
				.claim("userId", userId)
				.claim("userName", userName)
				.signWith(SignatureAlgorithm.HS512, tokenSignKey)
				.compressWith(CompressionCodecs.GZIP)
				.compact();
		return token;
	}
	public static Long getUserId(String token) {
		if(StringUtils.isEmpty(token)) return null;
		Jws<Claims> claimsJws = Jwts.parser().setSigningKey(tokenSignKey).parseClaimsJws(token);
		Claims claims = claimsJws.getBody();
		Integer userId = (Integer)claims.get("userId");
		return userId.longValue();
	}
	public static String getUserName(String token) {
		if(StringUtils.isEmpty(token)) return "";
		Jws<Claims> claimsJws
				= Jwts.parser().setSigningKey(tokenSignKey).parseClaimsJws(token);
		Claims claims = claimsJws.getBody();
		return (String)claims.get("userName");
	}
	public static void main(String[] args) {
		String token = JwtHelper.createToken(1L, "tom");
		System.out.println(token);
		System.out.println(JwtHelper.getUserId(token));
		System.out.println(JwtHelper.getUserName(token));
	}
}
